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Date:   Wed, 23 May 2018 22:12:08 +0200
From:   Pavel Machek <pavel@ucw.cz>
To:     Aaro Koskinen <aaro.koskinen@iki.fi>
Cc:     Pali =?iso-8859-1?Q?Roh=E1r?= <pali.rohar@gmail.com>,
        sre@kernel.org, kernel list <linux-kernel@vger.kernel.org>,
        linux-arm-kernel <linux-arm-kernel@lists.infradead.org>,
        linux-omap@vger.kernel.org, tony@atomide.com, khilman@kernel.org,
        ivo.g.dimitrov.75@gmail.com, patrikbachan@gmail.com,
        serge@hallyn.com, abcloriens@gmail.com, clayton@craftyguy.net,
        martijn@brixit.nl, sakari.ailus@linux.intel.com,
        Filip =?utf-8?Q?Matijevi=C4=87?= <filip.matijevic.pz@gmail.com>,
        Thorsten Leemhuis <regressions@leemhuis.info>
Subject: Re: v4.17-rc1: regressions on N900, N950
Message-ID: <20180523201208.GA31731@amd>
References: <20180422074213.GA12428@amd>
 <20180423202940.ig6iud5lrbgnu35a@darkstar.musicnaut.iki.fi>
 <20180521213952.GA11596@amd>
 <20180522080250.4fzyvqrgw5oigexn@pali>
 <20180522194139.GB2299@darkstar.musicnaut.iki.fi>
 <20180522205824.GA24927@amd>
 <20180522215638.GC2299@darkstar.musicnaut.iki.fi>
 <20180523140615.GA27180@amd>
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On Wed 2018-05-23 16:06:15, Pavel Machek wrote:
> On Wed 2018-05-23 00:56:38, Aaro Koskinen wrote:
> > Hi,
> >=20
> > On Tue, May 22, 2018 at 10:58:26PM +0200, Pavel Machek wrote:
> > > On Tue 2018-05-22 22:41:39, Aaro Koskinen wrote:
> > > > My device worked with v4.17-rc1 (haven't found time to test newer k=
ernels),
> > > > but if you say the probe order is random then we must find some pro=
per way
> > > > to express the dependency.
> > >=20
> > > I started bisect, but.. that will probably not be useful.
> > >=20
> > > If your device works ok in v4.17-rc1, it probably works in newer -rcs,
> > > too.
> >=20
> > Actually, my statement may be bogus... Now I tried again with -rc1
> > (and also -rc6) and it fails... But v4.16 works.
> >=20
> > > Thanks for the ordering hint, I'll try to figure out what is going on
> > > there.
> >=20
> > My bisection pointed to 6fa7324ac5489ad43c4b6351355b869bc5458bef which
> > doesn't seem to make any sense...?! So maybe there really is something
> > random stuff going on? :-(
>=20
> So... I did some experiments on v4.16.
>=20
> Swapping tsc2005@0 and lcd: acx565akm@2 entries in the dts does break
> stuff.
>=20
> I thought it might be due to vio regulator, but it does not appear
> so... screen still works with tsc2005 driver disabled in .config. (so
> there's noone to enable vio regulator).

Deleting tsc2005@0 entry also breaks screen.

Replacing tsc2005@0 entry with=20

        foobar@0 {
	               compatible =3D "not really with anything";
 		       spi-max-frequency =3D <6000000>;
 		       reg =3D <0>;
 };

still results in working touchscreen, removing any of the three fields
breaks it again.

Strange.

									Pavel

--=20
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blo=
g.html

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